问题：

[单选]

Your network consists of a single Active Directory domain. The functional level of the domain is Windows Server 2008 R2. All domain controllers run Windows Server 2008 R2.  
A corporate policy requires that the users from the research department have higher levels of account and password security than other users in the domain.  
You need to recommend a solution that meets the requirements of the corporate policy.
Your solution must minimize hardware and software costs.
What should you recommend？（）

A . Create a new Active Directory site. Deploy a Group Policy object （GPO） to the site.
B . Create a new Password Settings Object （PSO） for the research department’s users
C . Create a new organizational unit （OU） named Research in the existing domain. Deploy a Group Policy object （GPO） to the Research OU.
D . Create a new domain in the forest.Add the research department’s user accounts to the new domain.Configure a new security policy in the new domain.